How to Remove Air from a Water Heater?

Home and Garden

A water heater is an essential appliance in any household, providing hot water for various purposes. However, over time, air can accumulate inside the water heater, which can lead to a decrease in its efficiency and performance. In this article, we will discuss the steps to remove air from a water heater effectively. Let’s dive in!

1. Understanding the Importance of Removing Air from a Water Heater

Before we delve into the steps of removing air from a water heater, it is crucial to understand why this process is necessary. When air gets trapped in the water heater, it can cause several issues, including:

  • Reduced efficiency: Air bubbles in the water can hinder the transfer of heat, making the water heater less efficient.
  • Noise: Air bubbles can create a gurgling or bubbling noise as the water flows through the system.
  • Uneven heating: Air pockets can disrupt the even distribution of heat, leading to hot and cold spots in the water.
  • Corrosion: Air can accelerate the corrosion of the water heater tank and other internal components.

Now that we understand the importance of removing air, let’s move on to the steps involved.

2. Turn Off the Water Heater

Before attempting to remove air from the water heater, it is crucial to turn off the power supply. This ensures your safety and prevents any potential damage to the appliance.

3. Locate the Pressure Relief Valve

The pressure relief valve is a crucial component of the water heater that helps regulate the pressure inside the tank. To remove air, you need to locate this valve. It is typically found on the top or side of the water heater and looks like a small lever or handle.

4. Open the Pressure Relief Valve

To release air from the water heater, you need to open the pressure relief valve. This will allow the trapped air to escape. Place a bucket or container beneath the valve to catch any water that may be released along with the air.

5. Let the Air Escape

Once the pressure relief valve is open, you may hear a hissing sound as the air escapes. Allow the valve to remain open until you no longer hear any hissing noise. This indicates that the majority of the air has been released.

6. Check the Water Flow

After the air has been released, it is important to check the water flow. Turn on a faucet connected to the water heater and let it run for a few minutes. This will help flush out any remaining air from the system.

7. Close the Pressure Relief Valve

Once you have confirmed that the water flow is steady without any air bubbles, it is time to close the pressure relief valve. Simply push the lever or handle back into its original position.

8. Turn On the Water Heater

With the air removed and the pressure relief valve closed, you can now turn on the water heater. Follow the manufacturer’s instructions for restarting the appliance.


Removing air from a water heater is a crucial maintenance step to ensure its optimal performance and efficiency. By following the steps outlined in this article, you can effectively remove air from your water heater and enjoy a steady supply of hot water. Remember to prioritize safety and consult a professional if you encounter any difficulties during the process.

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